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B-20L-48B データシート(PDF) 5 Page - NEC

部品番号 B-20L-48B
部品情報  EMI Core
Download  31 Pages
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メーカー  NEC [NEC]
ホームページ  http://www.nec.com/
Logo NEC - NEC

B-20L-48B データシート(HTML) 5 Page - NEC

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EMI Core
5
EMI Cores
Ring Type
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9634ESDVOL09E1003E1
■Effective band range depending on core material
 There are two materials of ferrite, Ni-Zn series and Mn-Zn series. Ni-Zn series is effective
for MHz band range such as FM band while Mn-Zn series is effective for kHz band range.
 Note that above effective band range is a reference only. Examination of effectiveness
with actual instrument is necessary.
 As Mn-Zn series has lower resistance compared to Ni-Zn series, make sure to provide
adequate insulation before use.
■Characteristics and how to count turns
 Number of turns are counted by how many times the lead wire passes through the inner
hole of the core. Do not count the number of lead wire winding outside the core, as it results
in different turn count. (Fig. 1)
 When desired performance can not be obtained just by 1 turn, impedance characteristics
value can be raised by increasing the turn. In this case, the effective frequency band should
be checked that it is in the desired range as adding turns results in lowering down the
effective band range. (Fig. 2)
Tips on EMI Core Usages
1
10000
1000
100
10
1T
2T
3T
1
10
100
1000
Frequency (MHz)
(Representative Example:ESD-R-16C)
Fig.1 How to count turns
Fig.2 Relationship between impedance and turn counts
1T
2T
3T
Resonance point changes to lower band
*Number of lead wire wound outside the core + 1
= Number of read wire passes through the inner
hole of the core
= Turn count
Mn-Zn series vs Ni-Zn series|Z|-f Characteristics (representative example)
AM band range
FM band range
(measurement condition: measured with same-dimension ring core)
1
10
100
1000
0.01
0.1
1
10
100
1000
Frequency (MHz)
Mn-Zn series core
Ni-Zn series core
Fig.3 Effective Band Range of Mn-Zn series / Ni-Zn series ferrite


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